VINTAGE MAESTRO PS-1A PHASE SHIFTER WITH STAND & CASE

EXCELLENT CONDITION! 18 INCH "GOOSE NECK" STAND AND CASE INCLUDED!!

THIS IS THE VINTAGE MAESTRO PHASER HEARD ON COUNTLESS CLASSIC ALBUMS AND SONGS!

The top of the unit is slightly angled for improved visibility of the control panel. A six-pin Molex type connector located on the rear of the unit provides connection to an optional three-button footswitch that duplicates the operation of the three buttons, providing remote foot control of the phaser. 

Three colorful buttons located on the top of the unit select the phasing speed. The buttons are appropriately labeled SLOW PHASE, MEDIUM PHASE, and FAST PHASE. The SLOW PHASE button also functions as the bypass switch. One unique and very cool aspect of the Maestro Phase Shifter is the fact that the phasing speed ramps up or down when changing from one speed to another, similar to a Leslie rotating speaker cabinet. This feature is not to be overlooked or underemphasized!!! The dynamic effect produced by the ramp-up/down feature sounds absolutely superb when used by an accomplished musician - no other phaser offers this feature and that alone makes the Maestro Phase Shifter worth the price of admission! 

The Maestro Phase Shifter is AC powered and uses a non-polarized AC cord. A switch on the top of the unit turns it on and off. A fuse is provided on the rear of the unit. The classic Maestro emblem with its three colored "trumpets" is proudly displayed on the top of the unit.  

The PS-1A is a six-stage phase shifter. It utilizes Field Effect Transistors (FETs) as tuning elements for six cascaded all-pass filter networks with the input and output summed. An LFO modulates the FET control buss and includes a time constant so that when the LFO speed changes, it ramps up or down slowly, simulating the speed change of a Leslie speaker cabinet.

Being a true attempt to approximate a Leslie speaker, the Phaser features preset speeds with a fixed time constant LFO. Essentially, this means as one jumps between speeds, rather than snap to this new speed like one might expect with a toggle or rotary switch, the speed ramps up and down as the switches are flicked. The pliable rocker switches aren’t robust like modern footswitches, because foot operation wasn’t necessarily the endgame. The underside of the pedal contains a threaded mounting plate, so that one might fix one to a mic stand and use it in live performance.